ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

Your search history is empty.
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 5 (1982), S. 0 
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract. The apparatus described here is a fully portable, steady-state gas exchange system for simultaneous measurements of the CO2 exchange and transpiration of single, attached leaves. The leaf cuvette provides temperature, humidity, and CO2-concentration control. The system is suitable for either surveys or detailed studies of photosynthetic and stomatal responses to environmental variables. Representative data demonstrate the response time characteristics of the system and constitute the first field evidence of stomatal behaviour consistent with a recent hypothesis concerning the optimum pattern of stomatal conductance for the maximization of water-use-efficiency.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Rates of emission of H2S were measured for 10-week-old soybean plants (Glycine max L. Merr. cvs. Kent, Peking and York) raised in growth cabinets. Days were 12 h long, photosynthetically active radiation (PAR) was about 600 mE m-2 s-1, humidity was 50-60% and the temperature was 15 C at night and ...
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Oecologia 45 (1980), S. 372-376 
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Plants of the widely distributed species Heliotropium curassavicum L. have a large photosynthetic acclimation potential to temperature. There are, however, some differences among the acclimation potentials of populations occupying dissimilar thermal regimes. Plants of populations originating from a cool maritime climate have a greater acclimation potential than plants of populations originating from a desert habitat, which is characterized by large seasonal changes in temperature.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 4
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Despite the extrame aridity of the coastal Atacama Desert in northern Chile, sparse communities of leaf succulent shrubs and small cacti are regularly present. While most shrub species have small succulent leaves and accumulate high concentrations of salts in their tissues, the variable rooting patterns and mixed dominance of CAM and C3 species indicates a significant divergence in adaptive strategies. All dominant shrubs are readily surviving extended drought, but some species are much better able than others to maintain active growth and flowering. Regular flowering may not be a prerequisite for shrub population maintenance since large piles of viable seeds are present under the canopies of many species.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 5
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Diplacus aurantiacus produces a full canopy of leaves during the rainy winter and spring. As the drought begins in summer, all but the terminal leaves are lost. The leaves present during the growth period have a comparatively low specific weight and a high content of water, protein, and non-structural carbohydrate on a weight basis. Leaves of this type have a high carbon-gain per unit dry matter investment. The larvae of Euphydryas chalcedona utilize Diplacus as their principal food source. Following the first winter rains, the shrub starts to grow and the larvae of Euphydryas break diapause and begin actively feeding. Adults are produced which lay eggs that hatch into prediapause larvae. During the end of the growth period of the shrub, as the quality and quantity of Diplacus leaves decline, the prediapause larvae have a brief period of active feeding and growth and then enter diapause. Diplacus produces a leaf surface resin which inhibits the growth of Euphydryas larvae. It is present in the highest amounts on those few leaves that remain on the shrub during the drought period. The type and pattern of herbivore defense in Diplacus fits the model described for “apparent” plants.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 6
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Desert annuals of Death Valley, California have higher average light-saturated photosynthetic capacities and leaf nitrogen contents than do early-successional annuals of Illinois. The leaves of annuals in the light-unlimited Death Valley environment change little in specific weight, nitrogen, or photosynthetic capacity with age. In contrast, these properties decrease markedly with age in the leaves of the Illinois annuals even in leaves not exposed to the usual shading that accompanies canopy development. These results are interpreted in a carbon-gained-per-nitrogen-invested context.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 7
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The phenology of the Californian shrub, Diplacus aurantiacus has been shown to be closely tied to habitat water availability, and the life cycle of the checkerspot butterfly, Euphydryas chalcedona, is in turn tied to the phenological development of Diplacus. Here this relationship is further documented by showing how the activity patterns of both the shrub and the butterfly vary from year to year, but in synchrony, dependent on the breaking of the annual drought. The end of the feeding period for the post-diapause larvae coincides with flowering of Diplacus. At this time the quality of leaves as a food source for the larvae declines as nitrogen evidently moves from the leaves into plant reproductive parts. The abundance of leaves available as food for the larvae varies greatly with season. The few leaves present during the drought period, when the larvae are inactive, are low in nitrogen and high in resin content. Even during this period, though, these leaves contribute to the carbon economy of the plant. Of the leaves produced during the principal growing season, it is the youngest leaves with the highest nitrogen contents, and hence greatest potential carbon-gaining capacity, that have the highest resin contents. Larvae feed preferentially on the older, lower-resin-content leaves. It can be surmised thus that resin is a feeding deterrent and that its distribution within the plant results in the greatest protection of the plant's carbon-gaining capacity.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 8
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Three species of the barrel cactus Copiapoa (C. cinerea, C. columna-alba, C. haseltoniana) were investigated in their native habitats along the cool, arid coastal regions of the Atacama Desert in northern Chile. All species orient towards the north with a high degree of precision. Two consequences of adaptive value result from this northerly orientation. First, tissue temperatures of the meristematic and floral regions on the tip of the cactus receive high solar radiation loads which result in high temperatures (30°–40°C) relative to air temperatures (15°–20°) during winter and spring months when adequate soil moisture for growth is available. Second, absorption of solar radiation by the sides of the cactus is minimized, which reduces both the potential detrimental effects of light and heat load on the cactus and probably balances daily quanta absorbed for photosynthesis with nighttime CO2 uptake rates during drought stress periods.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 9
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary In spite of the ten times higher evaporative demand in a desert versus a coastal habitat, plants of populations of Heliotropium curassavicum from both show similar stomatal conductances in the field as well as under controlled conditions. The desert plants however have a plastic stomatal response to dry air growing conditions which results in a greater photosynthetic performance at negative water potentials. The root and stem resistance to water flow is lower in the desert plants resulting in the maintenance of a high transpiration rate without a large reduction in water potential.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Oecologia 56 (1983), S. 348-355 
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Photosynthetic capacity, leaf nitrogen content, and stomatal conductance decreased with increasing leaf age in the chaparral shrub, Lepechinia calycina, growing in its natural habitat. Efficiency of resource use for three resources that potentially limit photosynthesis did not, however, decrease with increasing leaf age. Light-use efficiency, given by the quantum yield of photosynthesis at low light intensities, was unaffected by leaf aging but decreased slightly through the winter and spring growing season. Water-use efficiency, the ratio of photosynthesis to transpiration at light saturation and with a constant water vapor concentration gradient, was not affected by leaf aging or seasonal change. Nitrogen-use efficiency, the ratio of photosynthesis at light saturation to leaf nitrogen content did not change with leaf age but was lower in the leaves with the highest specific weights. This ensemble of leaf-age effects is consistent with the hypothesis that aging represents resource redistribution and not uncontrolled deterioration.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...